PPT-A Case for Redundant Arrays of Inexpensive Disks (RAID)

Ofir Weisse EECS 582 W16 1 About the paper Published in 1988 Summarized existing technologies EECS 582 W16 2 Motivation Whats In the Box That we call a computer EECS 582 W16. The first implementations of RAID in 1990 were very expensive controller boards with high rmance IO processors that were as powerful as the host CPU At that time when hardwarebased RAID solutions were the only option the cost of a RAID controller li How are PCR Arrays Utilized The RT57522 Profiler PCR Arrays have been increasingly used in research on cancer immunology stem cells toxicology biomarker discovery and validation and phenotypic analysis of cells and transgenic animals Why PCR Arrays Fourie Joubert. Physical Storage. Physical disks may be inside the server, or in an external enclosure. The server may also be connected to storage in other ways, such as on a network. The physical disks may have platters, or be SSD. Computer Systems. Lecture 8: Storage Devices. Hard Drives. RAID. SSD. 2. Hard Drive Hardware. 3. A Multi-Platter Disk. 4. Addressing and Geometry. Externally, hard drives expose a large number of . sectors . RAID (Redundant Arrays of Independent Disks). Disk . organization technique that manages a large number of disks, providing a view of a single disk of. High capacity and high speed up using multiple disk in parallel. 1. Readings. Chapter . 10. 2. Long-term Information Storage. Three essential requirements:. Must store large amounts of data. Information stored must survive the termination of the process using it (. Lecture 39: IO Disks. Instructor: Dan Garcia. http://inst.eecs.Berkeley.edu/~cs61c/. 1. Technology in the News. www.cnn.com/2014/04/28/tech/innovation/google-self-driving-car/. 2. Review. . Exceptions are “Unexpected” events. Case Study: Facebook f4. Steve Ko. Computer Sciences and Engineering. University at Buffalo. Recap. Engineering principle. Make the common case fast, and rare cases correct. Power law. Haystack. A design for warm photos. A disk subsystem is a hard disk server.. Servers are connected to the . connection port . of the subsystem using standard I/O techniques such as SCSI, . fibre. channel etc.. The internal structure of the disk subsystem is completely hidden from the server. The server sees on the hard disks. . “Redundant Array of Inexpensive Disks”. CONTENTS. Storage devices.. Optical drives.. Floppy disk.. Hard disk.. Components of Hard disks.. RAID technology.. “Redundant Array of Inexpensive Disks”. CONTENTS. Storage devices.. Optical drives.. Floppy disk.. Hard disk.. Components of Hard disks.. RAID technology.. Two main types: Magnetic and Optical. Random access to memory. The hardware must be controlled by driver software called the “controller” in order to be used. Hard Disks, RAID, and Error Handling. media. PM Video 10:28. Selecting a Hard Drive. Some considerations when selecting a hard drive:. Drive capacity. Today’s hard drives range from 60 GB – 10 TB. Spindle speed (measured in RPM). Common spindle speeds are: 3600, 5400, 7200, 10,000, and 15,000 RPM. In an increasingly competitive market Communication Service Providers CSPs are being forced to quickly adapt to meet customer expectations and market trends by di31erentiating themselves from competit